Photographic imag-es



Wasaeaeww D. W. S. RAWSON, OF PERU, ILLINOIS.

Letters Patent N0.'S9,342, (lated April 27, 1869.

APPARATUS FOR MULTIPLYING PHOTOGRAPHIC IMAGES.

The Schedule referred to in these Letters Patent and making part of thesame.

Be it knownthat I, D. W. S. RAWSON, of the city of Peru, county of LaSalle, and State of Illinois, have invented a new and improved Method ofllIultiplying the Images in a Common Photographic Camera; and I herebydeclare the following to be a full and exact description thereof,reference being had to the accompanying drawings, and the letters ofreference marked thereon.

The nature of my invention consists in arranging,

in front of a common camera-lens, a set of lenses of' prism shape, or,what I prefer, the sectional parts of a concave lens, of sucientrefractive power to turn the light from the subject suiciently for eachpart to produce an impression in the camera, as represented in Figure 1,where A is the camera, C, a box, containingr the multiplying-lenses, andS, the subject, the dotted lines showing the direction of the light.

To construct such an apparatus, I first procure a concave lens, in sizeabout four inches in diameter for ordinary work. I out this into as manysections of equal size as it is intended to make pictures at oneimpression; if no more than four are required, they should be cut as inFigure 3, H, I, K, and L representing the dili'ereut sections. Theseveral sections are then reversed, as shown in Figure 4.

In this position H, I, K, and L are set in a frame, and, for ordinarywork, permanently; but when desix-ed to give the instrument the greatestrange, theframe should be so arranged as to allow the sections to moveto andfrom the centre, to vary the angle. to suit differentdistancesbetween the camera and multiplier. The frame is then placed inthe box C, which is fastened to the base-hoard B, with the centre of thelenses the same height from the board as the centre of the camera-lens.If the camera is now placed ou the board, shown in fig. l, and directedtothe subject, a number of images will be produced in the camera equalto the number of sections used.

I prefer using the sections taken from one lens only, as a slightvariation in the foci of different lenses would interfere with thesharpness of the different images in the camera.

As the position of the subject in each sectional lens will varyaccording to the distance between the multiplier and the camera, Iarrange a set of movable blcnders between, with openings a size smallerthan the lenses, to move to and from the centre, and thus keep thesubject in the centre of cach illuminated division in the camera.

These blcnders may be of any shade desired, and made of paper, or othermaterial, and as they act on the plate surrounding the dil'erent images,a light neutral tint will produce a pleasing eect, similar to the styleof card-photographs called vignettes.

The blenders may be moved by any device that will give them their properpositions, a convenient way being shown in fig. 2, with pivots, and thelever E.

The blender-s should be placed about one diameter of' the sectionallenses away, which, with the sides and top of the box, will form aperfect shade for the lenses.

What I claim as my invention, and desire to secure by Letters Patent,is-

l. The sectional parts of a concave lens, in front of a camel-alexis,for multiplying the number of images in the camera.

2. The adjustable blenders D D D D, fig. 2, moving to and from thecentre, by this, or an equivalent device, also the same movement for thelenses.

3. The box C, for shadingthe lenses when in use, and protecting fromdust when not in use.

D. W. S. RAWSON.

W'itnesses:

Coon ELY, M. E. L. CHUBBUCK.

